Generate Globs

Generate glob expressions by example.

Usage

Generate a list of globs that match all elements of whitelist and none of blacklist.

>>> import fnmatch
>>> # whitelist, blacklist = [], []
>>> globs = generate_globs(whitelist, blacklist)

generate_globs generates globs that fulfill both assertions:

>>> assert all([any([fnmatch.filter([white], glob) for glob in globs]) for white in whitelist])
>>> assert not any([fnmatch.filter(blacklist, glob) for glob in globs])

For example:

>>> generate_globs(whitelist=['data1', 'data2', 'data3'], blacklist=['admin']) 
{['data*']}

>>> generate_globs(whitelist=['a', 'b', 'c'], blacklist=['d']) 
{['[a-c]']}

Returns an empty list, if whitelist is empty.

Limitation

Generating good globs for arbitrary input is hard, thus only expect decent globs for "friendly" input. Also, don't use it for user input.

Running the tests

py.test -v  test_generate_globs.py